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tv   [untitled]    September 15, 2013 1:00am-1:31am PDT

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together so that it acts as a big buttress. we are allowing the wall of the building to act as a retaining structure. there was a time when we did not get any. there was an epic one before in 1982. we brought with us and rainfall charge. >> you were saying that this is somehow correlated to rainfall. this goes from 1914 until 2006. it is the red line in the backgrounds which are the annual rainfall from each year is plotted on here. you can see it varies all over the place. if you take an average, the average is a thin gray line. that does not give you a feel
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for what the rainfall really is. that is an average over four years. you can see that these build up until we had the big events before. >> you expect to see them during the apocrine fall. in fact, they might occur at that time but they may occur the year after and two years after because it has taken awhile for it to accumulate. this triggered some major landslides that we saw. these are portions of the cliff rotates out to sea. >> when we look at this cliff, can you tell us what of the features that we can see? >> we are lucky to have a very fresh exposure.
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there is a large overhanging block. at the very edge, you can see the roots coming out. they are part of the problem. in addition, these are sandstone and shale. they have been uplifted and faulted and put into the position they are in today. on the cliff face, you can see the bedding of the shale. there are vertical cracks that filled the water and plans is growing. -- and plants are growing. the cumulative effect of the fresh cut with the debris sitting on the ledge, luckily we have a chance there to protect us from rocks going on the street. >> this is one type of rock salt and we will look at a few others. what will we see?
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>> i think it would be appropriate. we have been talking about rock salt. there is instability that occurs at telegraph hill. this was more in the earth flow and debris flow kind of movement. this moves downhill as a result of the rations from the earthquake. that is where we are headed next. >> here we are on the next stop of our landslide for parent though this is the lagoon ouna a area. this is different from where we
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all were just add on telegraph hill. this is a whole different concept. tell us what we have to. we have the big hill behind us, what kind of formations do we have? >> this part of san francisco, we are out in the dune sands which makes up the hill to my right. a crusty old drainage that we are standing is bedrock, 160 million year-old sandstone. the project right in the hillside over there and then farther down along the path that goes to the reservoir. >> there are rock slides, there is unconsolidated material. we have an earth float type slide and a debris flows which are common on the these
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hillsides where you start to see the evidence of creaks when the trees start to lean over. >> this is a slow movement of the slope. >> yes. you can start to get moving. that will push the trees over a little bit. this had a special history. we had a lot of damage here. i guess the water from leaking laguna runs underground out to golden gate park. it covers about two or three blocks along side to seventh avenue. there was a lot of water damage we might have even had some liquefaction soil failure. we had a major failure. >> that's right. this tribute goes all the way to
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golden gate. this is in a mountain lake and beyond ththat, it was a surface flow. this is a reservoir. on my right is this defensive the positive dune sand. the wind blows, it comes from the ocean beach. because the sand is moving, you can see evidence along this side of the hill in 1989. the vibrations in accelerated. you have a significant amount of movement to the point that the homes that uc had very severe damage for two blocks. we recognized what the problem was at the time, it was a matter of loose sand on a very steep slope. thank you for the effort.
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we were able to get federal funding and design which you see in the upper walls. the lower walls was actually billed as part of the wpa. the upper wall was built in 1991-'92. this is a concrete wall and it has rocked going through the wall that extends the distance of 80 feet beyond the wall. the next earthquake occurs, the wall is designed to resist and the movement of the sand and allowed it to move down hill. this is a classic example of the creek and degree flow and exists all the way the area. we might see the other evidence. we have done nothing to improve the quality and the strength of the dam. >> one of the things that has
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come up in the policy issue over and over is that people are concerned that construction of a new building or the upper story might exacerbate these kinds of soil problems. we have extra review where we might have extra problems. it does that construction have an impact? it is a good idea to come to a peer review or a geotechnical review process as part of determining. >> in january of this year, the california building code requires almost all of san francisco that we get geologist and a geotechnical engineer. it was a state building code
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rather than just the local requirements. >> as you recall, this was called the edge hill ordinance. >> is this the same kind of condition? >> this is more of the rock, all on one side and on the other side -- >> this is a combination. >> a lot of sand hills were scrapes down and deposited to other places without being engineered or consolidated and people build on top of that. we have a whole change as the city surfaced.
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what is the deal with sand, is this a good place to build on? >> if you want to understand the properties and if you designed to mitigate any adverse effects of the settlement, this is the strongest. i live in the sunset, i have been doing this right on the other side of this hill. i see the same conditions exist here where we have the earthquakes and the sand shakes and it gets more dense. we see differential settlement of are on. >> they might have filled in a low land or a wet land and build on top of it. this is a fully grated sand. seeing difficult to distinguish what was natural.
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you could be growing like we do and as difficult to distinguish the context between this and the natural sand. we have to go by its consistency. >> in san francisco, we have a tremendous resource. we have a collection of soyoil supported that goes back many decades and they cover the whole realm of the city. we have them at the apartment building inspections. someone understands what they are. you can look at them and read them and find one in your neighborhood. is that right? >> that is true. many geologists have spent many years mapping the geologic conditions. there are excellent maps of the city. in fact, there are a hazard maps. in 1974, there was a landslide map.
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>> that's right. that is available at that apartment building inspection. these are excellent maps. >> there is a real legacy of geologists working and now cannot always published. san francisco has a great repository of some of these archives. there is a child just -- a geologist to publish letters that is a great source of information. we are on the coast, they have the definitive work for all of the [inaudible] >> and did they pick up the old [inaudible]
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and wetlands? >> there was a map of those that weren' off the field. you can see where these are with respect to those that have been filled in with a debris from the 06 earthquake. >> that is one of the things i've learned, the very local zones, exactly where you are building at. side-by-side, san francisco is so varied in its tomography and geology, you cannot tell by looking at the site specifically. >> this will be at the end of the drive.
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you can show which time we will be looking at out there. >> these are called rotational. >> there can be a lot of movement all at once. they can slowly creep for long amounts of time. >> here we are at the top of an escarpment that pretty much the end of the world. it is windy and cold. just south of here is some also rock where the san andreas fault goes into the pacific ocean.
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this is closest to the san andreas fault. many people believe that the closer you are to default, the greater the ground motion might be. that is a portion that is a south westerly portion of san francisco that has some special earthquake hazards. we are here to talk about the geology of this area. why don't you tell us about what is going on? >> there is a giant step here at the edge of the escarpment, the edge of the landslide. all the land to the west of us is part of a landslide that is upwards of 200 feet deep. it goes underneath the ocean. it causes damage and it was mapped by the earliest geologists'. there are many kinds of rocks here. there is a big sequence of
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merced formation. this is a base in deposit that was formed by the interaction at the end of the continental margin. >> this is just on top. this is the same material that we were looking at at the last site. you can see it is on our way to the last side. it is deposited here by wind. it is 40-50 feet thick. this acts as a big sponge. the water flows through and it gets in a lower formation and then the water level starts to rise and it becomes a reservoir
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for water. this is dissipated during the more dry months of the year. >> this forms a big long skinny basin and runs into san francisco. it is the coastal bluffs areas that are subject to erosion from the waves and the ground water that comes out and you start to lose this. this is the largest example of failure for a long part of the coast. it has been moving continuously for a long time. >> the ocean was at the same level as we are standing. in 1982, and massive slide occurred further to the north of and one day it moves 5 feet
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and by the second day it moves 30 feet out. all of that land down below was sitting out here. it was a great deal logic feature of the landslide further to the south. there were houses on top and there was a very steep slope. you can see some debris slides where the sand is slowing. then you drop into a gully or a drainage swell. the top of the landslides' is just a drop in the middle where another clock has pulled away from the edge. the higher hill on the outside edge of the rich and the depression is the drop. surface erosion is an acute issue. >> you can see the evidence of the houses directly adjacent. we have similar conditions to
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that. if you go around the corner around the seacliff, where in fact there has been significant movement and in fact many of the homeowners along that portion of the seacliff have had to come back in and do extensive foundation repair and massive walls to protect the home while the slope [inaudible] >> here we have the shallow slides, a debris slides. during earthquakes, they are both activated and the movement on the deep sea slides accelerates as well as the official material that erodes. >> if there's one point that is brought home from this
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discussion of landslides is san francisco is a part of the community that experiences many types of landslides, rockfalls, deportations. we need to be aware of the geologic and topographic setting we are in. when we are planning to build our home or buy a home or at additions to the home. if i have one suggestion, that is to seek information from the apartment building inspection. if you're not satisfied, there is ample information there. a geologist needs an opinion of the stability of the environment you're in. >> the building department will typically require that kind of information. people will do a major edition.
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what we are wondering is why we require that information. >> great, thank you very much. it is terrific. it is fun to see a lot of the city. thank you. >> you're watching quick bites, the show that is san francisco. and today you're in for a real treat. oh, my! food inspired by the mediterranean and middle east
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with a twist so unique you can only find it in one place in san francisco. we're at the 55th annual armenian festival and bizarre. this is extra special not only because i happen to be armenian, but there is so much delicious food here. and i can't wait to share it with all of you. let's go. armenia, culture and cusine has had much cultural exchanges with its neighbors. today armenian food infuses he flavor from the mediterranean, middle east, and eastern europe. >> this is our 55th year and in san francisco we're the largest armenian food festival and widely recognized as one of the best food festivals in the area. we have vendors that come up from fresno, from los angeles showing off their craft. we really feel like we have something for everyone in the neighborhood and that's really what it is, is drawing people to see a little bit of our culture and experience what we experience weekend in and weekend out.
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>> we are behind the scenes now watching the chef at work preparing some delicious armenian kabob. this is a staple in armenian cooking, is that right? >> absolutely, since the beginning of time. our soldiers used to skewer it on the swords. we have a combination of beef and lam and parsley. and every september over 2000 pounds of meat being cooked in three days. >> after all that savory protein, i was ready to check out the fresh veggie options. >> this is armenian cheat sheet. it's tomatos and mint and olive oil. that makes summer food. and what i'm doing is i'm putting some nutmeg. it is kind of like cream cheese. in armenia when they offer you food, you have to eat it. they would welcome you and food is very important for them.
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>> in every armenian community we feel like we're a "smallville"age and they come together to put on something like this. what i find really interesting about san francisco is the blends of armenia that come together. once they are here, the way people work together at any age, including our grandmothers, our grandfathers, skewering the meat, it's fun to see. fun to see everybody get together. >> we call it subarek. it's a cheese turn over if you want. we make the dough from scratch. we boil it like you do for la san i can't. >> the amount of love and karin fused in these foods is tremendous. they come in every day to prepare, cook and bake bread, all in preparation for this big festival. >> nobody says no. when you come them, they have to come tomorrow for the feast. >> what a treat it is to taste a delicious recipe, all made from scratch and passed down through generations. it really makes you appreciate the little things.
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>> it's one of the best festivals. it's outstanding, a marvelous occasion. >> we're outside checking some of the food to go options. i grabbed myself a ka bob sandwich, all kinds of herbs and spices. i'm going to taste this. looking fantastic. one of the best i've had in a long time. you know it's delicious b i have just enough room for dessert, my favorite part. we're behind the scenes right now watching how all the pastries get made. and we've got a whole array of pastries here. honey and nuts and cinnamon, all kinds of great ingredients. this is amazing. here's another yummy pastry made with filo dough. oh, my god. really sweet and similar, it's lighter. this is what i like.
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we have a lovely row here. looks like a very delicious and exciting surprise. i'm going to bite into it. here we go. um. this is great with armenian coffee. now we're making some incredible armenian coffee. >> we buy our coffee, they have the best coffee. they come from armenia, specially made. and would you like to try it? >> i would like to try. >> would you like sugar or no sugar? >> no sugar today. i'm so excited. really earthy. you can really taste the grain. i think that's what makes it so special. really comes out. i hope you try it.
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we're having a great time at the armenian festival. we ate, we saw, and we definitely conquered. i don't know about you, but i have to go down to the food. check out our blog for so much more at sf bites at tums until next time, may the force be with you. ♪ ♪ >> first of all, everybody is welcome and we ask two things when they get here. one, that they try something they've never tried before. be it food or be it dancing or doing something. and if they feel like it was worth their while to tell one person and bring that person, that family member, that friend down the street to come with them. >> we're going to have to do a lot of eating so get ready. >> get ready. and you diet tomorrow.
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